The ideal twofluid plasma model is a more generalized plasma model compared to the ideal MHD and it couples the ion and electron Euler equations via Maxwell's equations. Twofluid plasma model is essential when the ion and electron fluids are at different temperatures. In this work, a fundamental investigation on the effect of nondimensional light speed, iontoelectron mass ratio and plasma beta on the plasma dynamics in the BrioWu shock tube Riemann problem is presented. A one dimensional finite volume code is developed based on the macroscopic governing equations, with second order accuracy in space and time. The source terms are treated implicitly and the homogeneous flux terms are treated explicitly. The credibility of the numerical results is assessed by performing several linear and nonlinear tests.
Realistic light speed results in increasing the stiffness of the equations and severe time step restriction, which poses a challenge to the numerical simulations. In the context of the BrioWu shock tube problem, it is observed that the light speed is not important with respect to the hydrodynamics. However, light speed does affect the magnitude of the self generated electric field. Mass ratio affects the electron plasma dynamics. The speed of the fast moving electron plasma waves changes with the mass ratio. The results obtained using a mass ratio of 500 are in close agreement with that of realistic mass ratio of 1836. Increasing plasma beta suppresses the amplitude of the fast moving electron plasma waves.
Date of Award  Apr 2019 

Original language  English (US) 

Awarding Institution   Physical Sciences and Engineering


Supervisor  Ravi Samtaney (Supervisor) 

 twofluid plasma
 MHD
 Finite Volume Method